From http://www.w3schools.com (Copyright Refsnes Data)

XSL-FO block Object

Definition and Usage

The <fo:block> object defines a block of output. Blocks are sequences of output in rectangular boxes.

The <fo:block> object is used to format paragraphs, titles, headlines, etc.

Syntax

<fo:block>
  <!--
	Contents:(#PCDATA|bidi-override|character|
	external-graphic|instream-foreign-object|
	inline|inline-container|leader|page-number|
	page-number-citation|basic-link|multi-toggle|
	block|block-container|table-and-caption|
	table|list-block)*
  -->
</fo:block>

Properties

Property [A-J]	Property [K-Z]
azimuth	keep-together
background-attachment	keep-with-next
background-color	keep-with-previous
background-image	language
background-repeat	last-line-end-indent
background-position-horizontal	left
background-position-vertical	linefeed-treatment
border-after-color	line-height
border-after-style	line-height-shift-adjustment
border-after-width	line-stacking-strategy
border-before-color	margin-bottom
border-before-style	margin-left
border-before-width	margin-right
border-bottom-color	margin-top
border-bottom-style	orphans
border-bottom-width	padding-after
border-end-color	padding-before
border-end-style	padding-bottom
border-end-width	padding-end
border-left-color	padding-left
border-left-style	padding-right
border-left-width	padding-start
border-right-color	padding-top
border-right-style	pause-after
border-right-width	pause-before
border-start-color	pitch
border-start-style	pitch-range
border-start-width	play-during
border-top-color	relative-position
border-top-style	richness
border-top-width	right
bottom	role
break-after	script
break-before	source-document
color	space-after
country	space-before
cue-after	span
cue-before	speak
elevation	speak-header
end-indent	speak-numeral
font-family	speak-punctuation
font-selection-strategy	speech-rate
font-size	start-indent
font-size-adjust	stress
font-stretch	text-align
font-style	text-align-last
font-variant	text-altitude
font-weight	text-depth
hyphenate	text-indent
hyphenation-character	top
hyphenation-keep	visibility
hyphenation-ladder-count	voice-family
hyphenation-push-character-count	volume
hyphenation-remain-character-count	white-space-collapse
id	white-space-treatment
intrusion-displace	widows
	wrap-option

Example 1

Blocks are sequences of output in rectangular boxes:

<fo:block
  border-width="1mm">
This block of output will have a one millimeter border around it.
</fo:block>

Example 2

Blocks are sequences of output that can be styled individually:

<fo:block
  font-size="12pt"
  font-family="sans-serif">
This block of output will be written in a 12pt sans-serif font.
</fo:block>

Example 3

<fo:block
    font-size="14pt" font-family="verdana" color="red"
    space-before="5mm" space-after="5mm">
W3Schools
</fo:block>

<fo:block
    text-indent="5mm"
    font-family="verdana" font-size="12pt"
    space-before="5mm" space-after="5mm">
At W3Schools you will find all the Web-building tutorials you
need, from basic HTML and XHTML to advanced XML, XSL, Multimedia
and WAP.
</fo:block>

Result:

W3Schools

At W3Schools you will find all the Web-building tutorials you need, from basic HTML and XHTML to advanced XML, XSL, Multimedia and WAP.